Remember, unlike alot of SUV's, with Isuzu's full-time TOD on, the VX is truly rear-wheel drive biased, meaning the torque goes to the back first, where the LSD resides. This tendency is obviated when the 4L is engaged, then it mechanically equals things up, front to back, torque-wise. The automatic full-time TOD system was originally meant to allow smooth transfers of power across varying terrain, at relatively high cornering speeds for a tall vehicle. Superior, changing-terrain, handling was the primary purpose of the full-time VX TOD system. Swamp crawliing calls for the 4L mode, exclusively, and the addition of locked front hubs would help immensely to compensate for the lack of LSD on the front axel.